Still Don't Get It (Solar)

I wonder what a thin line, compact cooling design would entail? I'm thinking along the lines of any power supply, but on a larger scale. A shallow sheet metal box mounted to the back of the panel, making it say 3" deep overall. A fan at either end, tunneling air thru a narrow channel. Or even slots on the ends, and a central exhaust fan blowing out the back?

Would there be any significant net gain?

I guess I'll have to experiment with that, next summer.